(19)

(11)

EP 0 636 288 A1

(12)

(43) Date of publication: 01.02.1995 Bulletin 1995/05 (21) Application number: 93912251.0 (22) Date of filing: 14.04.1993

(51) International Patent Classification (IPC):  H03G 11/ 08( . ) H03G 7/ 00( . ) H03D 1/ 00( . ) (86) International application number: PCT/US1993/003536 (87) International publication number: WO 1993/021689 (28.10.1993 Gazette 1993/26)

(84) Designated Contracting States: DE FR GB (30) Priority: 14.04.1992 US 19920868490 (71) Applicant: ANALOG DEVICES, INCORPORATED Norwood, MA 02062-9106 (US)	(72) Inventor: GILBERT, Barrie Portland, OR 97229-5147 (US) (74) Representative: Warren, Anthony Robert, et al  BARON & WARREN, 18 South End, Kensington London W8 5BU London W8 5BU (GB)